Letter tray



FIG. 1 is a front perspective view of a letter tray showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a side elevational view;

FIG. 5 is a rear elevational view; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a letter tray, as shown. 